Patent GB-435651-A (GB)
Title: Selective oil or liquid dispenser
IPC: B67D7/30
Filed: 1934-10-22
Abstract: 435,651. Selectively dispensing oils &c. from storage tanks. DEHN, F. B., 103, Kingsway, London.-(Aro Equipment Corporation; Bryan, Ohio, U.S.A.) Oct. 22, 1934, No. 30305. [Class 116] In liquid-dispensing apparatus of the kind which discharges a predetermined quantity of oil or other liquid from a storage tank through a nozzle, a measuring cylinder is provided into which the liquid is first delivered to obtain the predetermined quantity, the measured quantity then being discharged from the measuring cylinder under pressure, air being subsequently blown through the measuring vessel and the dispensing nozzle. Means are provided for delivering liquid to the measuring cylinder from any selected one of a number of tanks. The air may be blown through the dispensing apparatus after the measuring vessel has been filled and discharged once or a number of times. An indicator is provided which registers each discharge of the measuring cylinder. Dispensing is initiated by the removal of the delivery nozzle from its hook. Heaters are provided adjacent various valves to facilitate the flow of oil. Mechanism for liquid selecting and setting-gear for the delivery of a predetermined quantity. A knob o<1>, Fig. 2, bearing numbers 11<a> corresponding to the number of supply tanks is splined on a spindle 13<a> and is first pressed axially to engage with an indicator 76 which is splined on a sleeve 86 freely mounted on the spindle 13<a> and which bears numbers 78 indicating quantities of which the volume of the measuring cylinder is the unit. The knob o<1> while thus pressed, is rotated to bring the number 78 representing the required quantity into view in a window 80, a lamp 78<a> being provided to illuminate the numbers as they appear in the window. Throughout this operation the sleeve 86 is displaced axially against the pressure of a spring 88, so that ratchet wheels subsequently to be referred to, on the sleeve are disengaged from their co-operating members. When the required setting has been made, the knob o<1> and sleeve 86 are allowed to return axially, and the knob o<1> is then rotated to align a port 23 in a valve 15 with one of a number of connections 23<a> from the liquid supply tanks, the selected tank being indicated by the number 11<a> adjacent a fixed pointer 11. General operation. The pre-setting operations having been effected, the nozzle 48, Fig. 1, is removed from its hook D<1> whereupon a valve D admits compressed air to the various valve-boxes shown, the air passing by way of the box F to a connection 17 on the setting mechanism o<1> whence it passes through the selected port 23a to open a valve A, and also by way of a non-return valve 176 and valvebox T to apply pressure to the surface of liquid 170a in a sump which is gravity fed under float control from a supply tank S. The liquid is thus discharged from the sump, past the valve A to the measuring cylinder B, a piston 22 therein rising until it actuates a member 26 coupled to a yoke which rocks a spring-controlled lever E to open the valve E, whereupon compressed air closes the valve F (to isolate the sump from air pressure), opens the liquid discharge valve C, and forces the piston 22 down to deliver the liquid by way of the valve C and hose 44 to the dispensing nozzle 48. Simultaneously with this action, the valve T is opened to vent the imprisoned air from the sump by way of the tank S and a vent 203 therein. During the upward movement of the piston 22, air is vented from the part B<11> of the measuring cylinder, past a valve G and valve 160, but at the end of the up stroke of the piston, the valve G is shut, and on the entry of compressed air into the part B<11> the pressure in the pipe 25 drives a piston P<1> Fig. 10 to position a pawl 113 ready to rotate a pointer-carrying ratchet wheel 129 when pressure is released from the part B<11>, this release being effected by the actuation of the yoke member 30 (with resultant opening of the valve G and closure of the valve E) by the piston 22 at the end of its downstroke. The admission of compressed air to discharge the liquid from the measuring cylinder, coincides with the admission of air to a cylinder 132, Figs. 1, 6 to depress a spring-pressed pawl-carrying plunger 134, the release of pressure at the termination of delivery allowing the spring 146 to return the plunger 134 and rotate the sleeve 86 by the ratchet wheel 126 through the space of one tooth. The rotation of the sleeve 86 is positively controlled by an escapement mechanism 114, 116, Fig. 5, actuated by a plunger 122 driven by air pressure delivered by way of the valve 160 Fig. 1, from the valve box G, the plunger having exhaust ports 125 to release the air after predetermined movement of the plunger. The rotation of the sleeve 86 also rocks a lever 100, Fig. 4, to actuate a valve 108 (see also Fig. 1) in order to bleed pressure air from the valve actuators T<1> C<1> and F<1> thus allowing these valves to close. The valve 108 can also be manually operated at any time by a handle 106. The cycle consisting of charging the cylinder B with liquid and delivering the liquid through the nozzle 48 thereupon recommences and is repeated, the sleeve 86 rotating tooth by tooth at each delivery operation until a notch 153<a> Fig. 7, in a member 153 on the sleeve throws the valve 160 from the seat 164 to the seat 162 (see also Fig. 1), whereupon, at the end of the last delivery, the compressed air from the part B<11> of the measuring cylinder sweeps past a non-return valve 9, through the lower part of the measuring cylinder and out through the nozzle 48. This scavenging of the dispensing apparatus is completed by compressed air being delivered past a valve J which is opened by a charge of compressed air 68 when the last charge of compressed air flowing from the cylinder B<11> actuates a valve M. A valve box H having a small port 65 is provided for maintaining the air system charged, and vents such as 57 are provided where necessary to allow valves to return to their seats. The operation of dispensing is completed by the replacement of the nozzle 48 on its hook D<1> thus cutting off the compressed air supply. The pointer indicating the number of times the measuring cylinder has been filled and emptied may be zeroized by manual actuation of a knob 139, Fig. 10, which releases the pointer-carrying ratchet wheel 129 and allows it to rotate under the influence of a clock spring. The gear for setting the apparatus to effect a predetermined number of deliveries may be omitted. In this case the nozzle is provided with a valve which must be manually actuated before delivery can commence, and a vent valve is also provided on the nozzle to bleed air from the various valve actuating devices, this operation being necessary prior to each delivery. The indicator gear registering the number of deliveries includes a cam which, after each complete revolution of the indicator unlocks the drum carrying one end of the clock spring and allows the drum to make one revolution, under the control of an adjustable brake, after which the drum is again locked, this arrangement ensuring that the clock spring is not accumulatively tensioned for more than one revolution of the indicator. In a further modification the tanks are maintained continually under air pressure, each tank having a delivery valve controlled by a piston actuator to any selected one of which a pipe line from the valve F may be coupled. The liquid flowing may rotate a vaned cylinder to give a visual indication of the particular liquid being delivered.